Royal Selangor Ace Glass And Cooling Coaster PairKeep your drinks cool with style. The coasters feature symbols of all four suits and are designed to function as decorative and practical items. For best cooling results, chill the coaster in the freezer, and your preferred beverage in the refrigerator, for an hour before use. The chilled coaster should keep your drink sufficiently cooled for about 2 hours. If a dropped or damaged coaster leaks coolant, the liquid is water and poses little risk. Size: